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std::bitset::test

Da cppreference.com.
< cpp‎ | utility‎ | bitset

 
 
Utilità libreria
Tipo di supporto (basic types, RTTI, type traits)
Gestione della memoria dinamica
La gestione degli errori
Programma di utilità
Funzioni variadic
Data e ora
Funzione oggetti
initializer_list(C++11)
bitset
hash(C++11)
Gli operatori relazionali
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Coppie e tuple
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Swap, in avanti e spostare
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
std::bitset
Membri tipi
Original:
Member types
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bitset::reference
Membri funzioni
Original:
Member functions
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bitset::bitset
bitset::operator==
bitset::operator!=
Elemento accesso
Original:
Element access
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bitset::operator[]
bitset::test
bitset::all
bitset::any
bitset::none
(C++11)

 
bitset::count
Capacità
Original:
Capacity
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bitset::size
Modificatori
Original:
Modifiers
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bitset::operator&=
bitset::operator|=
bitset::operator^=
bitset::operator~
bitset::operator<<=
bitset::operator>>=
bitset::operator<<
bitset::operator>>
bitset::set
bitset::reset
bitset::flip
Conversioni
Original:
Conversions
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bitset::to_string
bitset::to_ulong
bitset::to_ullong(C++11)
Non membri funzioni
Original:
Non-member functions
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operator&
operator|
operator^
operator<<
operator>>
Helper classi
Original:
Helper classes
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std::hash(C++11)
 
bool test( size_t pos ) const;
Restituisce il valore del bit nella pos posizione.
Original:
Returns the value of the bit at the position pos.
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A differenza di operator[](), esegue un controllo limiti e getta std::out_of_range pos se non corrisponde ad una posizione valida nel bitset.
Original:
Unlike operator[](), performs a bounds check and throws std::out_of_range if pos does not correspond to a valid position in the bitset.
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Indice

[modifica] Parametri

pos -
posizione del bit di ritornare
Original:
position of the bit to return
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[modifica] Valore di ritorno

true se il bit richiesto è impostato, false altrimenti.
Original:
true if the requested bit is set, false otherwise.
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[modifica] Eccezioni

std::out_of_range pos se non corrisponde ad una posizione valida all'interno del bitset.
Original:
std::out_of_range if pos does not correspond to a valid position within the bitset.
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[modifica] Esempio

#include <iostream>
#include <bitset>
 
int main() 
{
    std::bitset<10> b1("1111010000");
 
    size_t idx = 0;
    while (idx < b1.size() && !b1.test(idx)) {
      ++idx;
    }
 
    if (idx < b1.size()) {
        std::cout << "first set bit at index " << idx << '\n';
    } else {
        std::cout << "no set bits\n";
    }
 
    return 0;
}

Output:

first set bit at index 4

[modifica] Vedi anche

accede specifico bit
Original:
accesses specific bit
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(membro pubblico funzione) [edit]